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No. 402,407. Patented Apr. 30 1889.

UNITED STATES PATENT OFFICE.

LOUIS J. CREOELIUS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO ANDREW WARREN, OF SAME PLACE.

LIFTlNe-JACK,

SPECIFICATION forming part of Letters Patent No. 402,407, dated April 30, 1889.

.following is a full, clear, and eXact description of the same.

i My invention is an improved lifting-jack,

and relates specially, lfirst, to an improved,

form of grip, and, secondly, to lowering means, while at the same time I have generally improved the construction of the j ack to better effect the action of the lifting devices.

I have heretofore been granted patents relating to jacks embodying the samev general principle of the jack shown in this application-namely, a lifting-bar vertically movable Within a standard, with a grip contained in a chamber in the standard-head, and a movable clutch-box, also containing a grip, ,with an operating-lever for giving a vertically-reciprocating movement to the clutch-box, in order to raise the lifting-bar with its load. These the standard and bar and the clutch-box,

with my invention as applied to one side of the lifting-bar. Fig. 2 is a horizontal section on line a; m o'f Fig. l. Fig. 3 is a sectional view of a modification, and Fig. 4 is a modiied form of grip. Fig. 5 is a sectional View of the standard and lifting-bar,with modified means for releasing the gripin the standard and throwing aside .the lowering-lug. Fig.

6 is a detail sectional View through the clutch-box, showing the cam-shaft as adapted to Work directly against the face of the lifting-bar.

In the drawings the standard is shown at A, and the lifting-bar at B, and this liftingbar may be tapered, as shown in Fig. 1, and

9. Serial No. 297.610.

(No model.)

endin line with the channel through which the lifting-bar passes, and this recess may have a backing-plate to take up the wear, as in Letters Patent No. 383,709, of May 29, 1888, and the lifting-bar, or that face which is in contact with the gripping devices, may also be protected by awearing-plate. Within the recess in the standard, which has an inclined rear Wall, is a grip, c1., which may be a roller, as shown in Fig. l, a segment, as in Fig. 4, a Wedge as in Fig. 5, or any of the forms of grips shown in my aforesaid patents, or any other which may be suitable for the purpose. This grip a, it will be understood, serves to hold the bar from slipping when it is released from the grip within the clutch-boX, and while the operator is taking a fresh hold through the lifting-lever.

The clutch-box is shown at C, and encircles the lifting-bar, having av chamber in which is held a clutch-block, b, which is in contact With the face of the lifting-bar, and serves to grip it under the action of a cam-sbatte, operated through a connection with the lever d, which is fulcrumed on'the upper end of the standard. This connection consists of short arms l l, extending from the cam-shaft and connected with the lower end of the lever by links 2 2. Any suitable lever may be used, and any connection between the lever and the cam-shaft adapted to operate the same may be substituted for the connection shown.

The clutch-block or grip b is shown as fitting snugly the chamber within the clutchboX; but this is not essential, though I prefer it. shaft is turned so that its cam-face forces in- Wardly the clutch-block against the face of the lifting bar, and thus forms a grip which enables the block to lift the bar under the continued action of the lever; but it will be understood that instead of the clutch-block By the movement of the lever the cam-` IOO or any equivalent thereof the cani-shaft may be arranged a little closer to the face of the lifting-bar, and thereby act directly thereupon without the interposition of anything whatever, as shown in Fig. G. For the sake of durability, however, and to take up the wear, I prefer to interpose either the clutchblock or some equivalent thereof.

At e, in Fig. l, I have shown a lowering-lug pivoted at its inner corner to the lower part of the clutch-box, the pivot passing through the side nearest to the face of the liftingblock, so that in its normal position the lug will swing in by force of gravity close to the face of the lifting-bar, and in this position, as the bar is held by the grip in the standard, the clutch-box may be lowered to take a fresh hold upon the lifting-bar, and the lug will pass through an opening in the top of the standard fitted to receive it, which will thus allow the bottom of the clutch-box to come in contact with and rest upon the top of the standard.

In Fig. 3 I have shown a modified form of the lug e, and in this iigure, instead of supporting it by pivoted connect-ion with the frame of the clutch-box, I slot the lower part of the box and pivot the lug directly to the clutch-block l1, so that as the said block moves in or out under the act-ion of the lever or the lifting-bar the said lug will maintain the same relative position to the face of the bar. This is specially desirable when the tapered lifting-bar is used.

In order to effect the operation of lowering either instantaneously or gradually, as may be required, I provide a foot-lever for releasing the clutch in the standard, and at the same time to throw out the lug e., so that as the clutch-box lowers the said lug will be out of line with the opening in the top of the standard, and will thus support the clutch-box by its engagement with the standard. This consists of a foot-lever, f, pivoted at 3, and a rod, g, connecting with its inner end, this rod extending up between the face of the liftingbar and the channeled face of the standard. In its normal position the upper end of this rod rests within the groove in the center of the gripping-face within the recess in the standard, so that it does not interfere with the action of the grip in said recess under normal conditions. This rod is provided with a stud, i, projecting froln one side, which, when the rod is in its lowest position, simply remains inactive at the bottom of the recess; but when it is desired to release the lifting'- bar from the action of this grip the operator simply places his foot upon the treadle, depressing the saine, which lifts the rod g, and through the stud 4 raises the grip out of contact with the bar. At the same time the inclined end of the rod g strikes the inner edge of the lug e and throws it to one side,so that, as before stated, this lug rests upon the head of the standard and supports the clutch-box thereupon. In this position, as thegrip in the standard is out of engagement with the lifting-bar, the bar maybe lowered gradually by a slight upward movement of the operating-lever, or by throwing the lever into a position to release the lifting-bar from the grip of the clutch-box the said bar will fall at one movement to its lowest position.

So long` as the upper end of the rod g is between the lug e and the face of the liftingbar the said lugwill be kept in contact with the standard; but as soon as the rod is lowered the lug will slip from its position upon the standard by gravity, and by rounding either the corner of the lug or that part of the standard upon which it rests it is thus allowed to slip off easily and to fall into the opening in the top of the standard,which thus brings the clutch-box into its normal position.

In Figqat I have shown a modified form ofv grip adapted to be used in the standard, this being a segment pivoted within the recess in the standard-head, and having a curved gripi ping-face adapted for contact with the-lifting?y connected to the lower end of said wedge, and

in order to operate the lowering-lug in the upward movement of the grip ain this figure I provide the grip with an upward extension, a', which tapers to a point,so that as the grip is moved upwardly the extension a throws the lowering-lug outwardly in the manner and for the purpose before described. It will be understood, also, that the rod g may pass up in a groove in the lifting-bar, instead of in the face of the grip in the standard.

I claiml. In a lifting-jack, a standard, a liftingbar, a holding-grip in the standard, a clutchbox, a cam-sh aft within the clutch-box, an operating-lever, and a positive connection between said lever and the cam-shaft for operating the same to grip and raise the liftingbar, substantially as described.

2. In a lifting-jack, a standard, a liftingbar, a clutch-box, a cam-shaft within said clutch-box, an operating-lever pivoted on the standard, arms l l., secured to the cam-shaft, and links connecting said arms with the lower end of the lever, substantially as described.

In a lifting-jack, a standard, a liftingbar, a clutch-box, a cam-shaft, an interposed clutch-block between said shaft and the face of the li fting-bar, an operating-lever, and connections between said lever and the cam-shaft, substantially as described.

l. In a lifting-jack, a standard, a liftingbar, a grip within the standard, a clutch-box carrying a grip, a lever and connections for operating said grip, a lowering-lug carried by the clutch-box, the standard having an opening in line with the normal position of the IOO IIO

V402,40*? Y e a grip in the standard, a clutch-box, a clutch block within the saine, an operating-lever, a lowering-lug Carried by said clutch-block and pivoted at one corner,V the standard having an opening in the` top thereof in line with the normal position of the lowering-lug, and a rod for releasing the grip in the standard and for throwing aside the lowering-lug, substantially as described. Y

In testimony whereof I have signed my name to this speeieation in the presence of two sub- 25 seribing` witnesses.

LOUIS J. CRECELIUS.

Witnesses: Y

GHAs. A. THoMPsoN, C. D. GREENE, J r. 

